20

Field Name

Description

MOT

Motion since last report

0 = No motion

1 = Motion occurred, data ready for reading in Delta_X_L, Delta_Y_L and Delta_XY_H registers

PIXRDY

Pixel_Grab data byte is available in Pixel_Grab register

0 = data not available

1 = data available

PIXFIRST

This bit is set when the Pixel_Grab register is written to or when a complete pixel array has been read,

initiating an increment to pixel 0,0.

0 = Pixel_Grab data not from pixel 0,0

1 = Pixel_Grab data is from pixel 0,0

OVF

Motion overflow, ΔY and/or ΔX buffer has overflowed since last report

0 = no overflow

1 = Overflow has occurred

LP_VALID

Laser Power Settings

0 = register 0x1a and register 0x1f or register 0x1c and register 0x1d do not have complementary values

1 = laser power is valid

FAULT

Indicates that VCSEL is shorted to GND or VDD

0 = no fault detected

1 = fault detected.

Note:

PixArt recommends that registers 0x02, 0x03, 0x04and 0x05 be read sequentially.

Bit

7

6

5

4

3

2

1

0

Field

MOT

PIXRDY

PIXFIRST

OVF

LP_VALID

FAULT

Reserved

Reserved

Motion

Address: 0x02

Access: Read/Write

Reset Value: 0x00

Data Type: Bit field.

USAGE: Register 0x02 allows the user to determine if motion has occurred since the last time it was read. If the MOT

bit is set, then the user should read registers 0x03 and 0x04 to get the accumulated motion. Read this register before

reading the Delta_X_L, Delta_Y_L and Delta_XY_H registers.

Writing anything to this register clears the MOT and OVF bits, Delta_X_L, Delta_Y_L and Delta_XY_H registers. The

written data byte is not saved.

If one of the 12 bits motion registers overflows, then absolute path data is lost and the OVF bit is set. Once OVF bit set,

Sensor will stop accumulating motion data. Motion registers and OVF bit will be clear after data been read out.

The PIXRDY bit will be set whenever a valid pixel data byte is available in the Pixel_Grab register. Check that this bit

is set before reading from Pixel_Grab. To ensure that the Pixel_Grab pointer has been reset to pixel 0,0 on the initial

write to Pixel_Grab, check to see if PIXFIRST is set to high.

All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission.

PixArt Imaging Inc.

PixArt Imaging Inc.

ADNS-7550 Integrated Molded Lead-Frame DIP Sensor